I have uploaded the hw configuration from CPU319 and lost all the names assigned to drive and IM modules

How can I copy the namings from master backup to uploaded backup for existing elements.

Copying
symbol table is necessary for element in your program.For designation
in modules,hw config, you can check it manually or doing it by
exporting .cfg file, edition by a text editor (compare it with
reference from offline project, and import again.

I have imported HW config from uploaded backup but the symbols are not assigned automatically

Choose one of the ways explained here to solve your problem:

Compare both hardware and program offline/online , and if they are the same you don't need an upload.In case of slight mismatches follow the next steps.

Copy the symbol table from original offline back up to uploaded version and check the outcome.

If the hardware configuration is not complete, or missing some parts such as names and designations, export hardware of both project and compare them with text comparators such as Araxis or online tools to find the differences.Make a final .cfg file-->Import hardware and copy the program.

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Copying the symbols from offline backup to uploaded backup is not working.To compare with text online tools is bit complicated due to so many devices.Is their anyway which could help to makeout the differences???

The easiest way to find out if the hardware is exact (offline/online), is to check the checksum for system data in properties of blocks folder.But the result is YES/NO and if it is not , you need a detail search to perform.